XCode 内置了 OCUnit 单元测试框架，但目前最好用的测试框架应该是 GHUnit。通过 GHUnit + OCMock 组合，我们可以在 iOS 下进行较强大的单元测试功能。本文将演示如何在

在iOS SDK 5.0中使用ARC之后，有些东西咱们还是得在对象销毁的时候做，比如说注销Observer什么的，这个时候还是得重写dealloc方法。但是调用[super dealloc]时系统会提示ARC forbids
explicit message send of ‘dealloc’，怎么办呢？

根据苹果官方文档（https://developer.apple.com/library/ios/#releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html）的精神，我们无需在重写的dealloc中添加[super dealloc]，因为sdk在编译的时候会自己添加上去。

官方文档相关描述如下：

You may implement a

dealloc

method if you need
to manage resources other than releasing instance variables. You do not have to (indeed you cannot) release instance variables, but you may need to invoke

[systemClassInstance
setDelegate:nil]

on system classes and other code that isn’t compiled using ARC.

Custom

dealloc

methods in ARC do not require a
call to

[super dealloc]

(it actually results in
a compiler error). The chaining to super is automated and enforced by the compiler.